# US 11,896,128 B2 · Sofa bed

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- Number: US 11,896,128 B2
- Document ID: US11896128B2
- Status: Granted
- Kind: B2
- Application number: 17/575,539
- Filed: 2022-01-13
- Published: 2022-07-21
- Granted: 2024-02-13
- Earliest claimed: 2021-01-18
- Assignees: New-Tec Integration (Xiamen) Co., Ltd.
- Applicants: New-Tec Integration (Xiamen) Co., Ltd.
- Inventors: Luhao Leng
- Web page: https://patentgrep.com/patent/US11896128B2

## CPC

- A47C 17/162: {with adjustable back-rest}
- A47C 17/1753: {by sliding, e.g. by rollers}
- A47C 7/347: {with means for connecting springs to each other or to seat frame}
- A47C 23/002: {with separate resilient support elements, e.g. elastomeric springs arranged in a two-dimensional matrix pattern}
- A47C 27/065: {of special shape}
- A47C 27/07: Attaching, or interconnecting of, springs in spring inlays
- A47C 7/34: with springs in compression, e.g. coiled
- A47C 27/00: Spring, stuffed or fluid mattresses {or cushions} specially adapted for chairs, beds or sofas
- A47C 27/04: with spring inlays (A47C27/20 takes precedence)
- A47C 27/06: Spring inlays or spring units therefor
- A47C: CHAIRS; SOFAS; BEDS

## Abstract

A sofa bed includes: a plurality of elastic modules; a body frame having slide rails arranged thereon; and armrest frames disposed at two sides of the body frame along a longitudinal direction of the body frame, respectively. The slide rails on the body frame are configured to enable the plurality of elastic modules to be mounted on the body frame from an outside of the body frame and to slide thereon to predetermined mounting positions, such that the body frame at one side facing the user is provided with the plurality of elastic modules. The angle between the seat and the backrest portion can be locked for improved operation. The elastic modules, which can be easily installed and uninstalled, can improve the comfort of the sofa bed.

## Claims

### Claim 1

A sofa bed, comprising:
a plurality of elastic modules, each comprising a conical spring and a spring bracket configured to receive the conical spring;
a body frame comprising a plurality of longitudinal supporting members arranged to intersect perpendicularly a plurality of transverse supporting members;
armrest frames at opposite sides of the body frame;
each supporting member having a slide rail configured to engage with a bottom portion of a corresponding spring bracket with the plurality of elastic modules arranged to slide on the slide rails;
each longitudinal supporting member having a longitudinal slide rail;
each transverse supporting member having a transverse slide rail;
the longitudinal slide rails intersecting the transverse slide rails to allow the elastic modules to be moved longitudinally and transversely on the body frame;
the elastic modules mountable onto the body frame via an open end of one or more of the longitudinal or transverse slide rails.

### Claim 2 (depends on 1)

The sofa bed of claim 1, wherein the spring bracket of each of the plurality of elastic modules comprises a base having a spring mounting seat, the spring mounting seat having a spring fixing part for fixing a first end of the conical spring.

### Claim 3 (depends on 2)

The sofa bed of claim 2, wherein the spring bracket of each of the plurality of elastic module further comprises:
an end cover on a second end of the conical spring; and
a plurality of flexible straps between the spring mounting seat and the end cover, the flexible straps disposed outside the conical spring.

### Claim 4 (depends on 2)

The sofa bed of claim 2, wherein each of the plurality of elastic modules further comprises a covering wrapping the conical springs of the plurality of elastic module.

### Claim 5 (depends on 1)

The sofa bed of claim 1, wherein the conical spring is mounted within the spring bracket in a predetermined initial compressive force.

### Claim 6 (depends on 1)

The sofa bed of claim 1, wherein each longitudinal slide rail has an open end configured to receive the elastic modules.

### Claim 7 (depends on 1)

The sofa bed of claim 1, wherein each transverse slide rail has an open end configured to receive the elastic modules.

### Claim 8 (depends on 1)

The sofa bed of claim 1, wherein the transverse slide rails are disposed in a middle of the body frame in the longitudinal direction the transverse slide rails having open ends configured to receive the elastic modules from outside of the body frame, and then be moved into engagement with longitudinal slide rails at one of the intersections of the transverse slide rails and the longitudinal slide rails.

### Claim 9 (depends on 1)

The sofa bed of claim 1 wherein the body frame comprises a seat portion and a backrest portion disposed adjacent to each other, the seat portion and the backrest portion configured to be folded or unfolded around a locking mechanism so that the body frame is changed between a bed configuration and a sofa configuration;
each of the armrest frames has a slideway to guide movement of the locking mechanism;
wherein locking mechanism is configured to lock the backrest portion relative to the seat portion in a predetermined angle (a) when the backrest portion and the seat portion are pivoted relative to each other around the locking mechanism, and the armrest frames are connected via the locking mechanism to the body frame so that a part of the locking mechanism can drive the body frame to displace guided by the slideway in a locked state.

### Claim 10 (depends on 9)

The sofa bed of claim 9, wherein the locking mechanism comprises:
a seat portion connecting rod attached to a transverse edge of the seat portion and extending along the transverse edge;
a backrest portion connecting rod attached to a transverse edge of the backrest portion located at the same side as the transverse edge of the seat portion and extending along the transverse edge of the backrest portion; and
a pivot connecting the seat portion connecting rod and the backrest portion connecting rod so that the backrest portion and the seat portion are caused to pivot relative to each other.

### Claim 11 (depends on 10)

The sofa bed of claim 10, wherein the body frame is configured to release locking between the seat portion connecting rod and the backrest portion connecting rod when the seat portion is operated in a locked state to pivot towards the backrest portion.

### Claim 12 (depends on 11)

The sofa bed of claim 11, wherein one of the seat portion connecting rod and the backrest portion connecting rod is provided with a ratchet, and the other of the seat portion connecting rod and the backrest portion connecting rod is provided with a pawl, wherein the ratchet and the pawl cooperate with each other to lock the backrest portion relative to the seat portion in a predetermined angle.

### Claim 13 (depends on 12)

The sofa bed of claim 12, wherein the ratchet is provided at an outer edge with a recess recessed inwards in a radial direction of the ratchet (and the pawl is provided with a protrusion corresponding with the recess, wherein the protrusion is configured to engage with the recess when the backrest portion is set at the predetermined angle relative to the seat portion, thereby locking the backrest portion and the seat portion.

### Claim 14 (depends on 9)

The sofa bed of claim 9, wherein the seat portion and the backrest portion are all of a rectangular structure.

### Claim 15 (depends on 14)

The sofa bed of claim 14, wherein a side of the seat portion extending in the longitudinal direction is disposed adjacent to a side of the backrest portion extending in the longitudinal direction.

### Claim 16 (depends on 9)

The sofa bed of claim 9, wherein the body frame is configured to lock the backrest portion relative to the seat portion in a plurality of different predetermined angles.

### Claim 17 (depends on 9)

The sofa bed of claim 9, wherein the body frame further comprises a driven beam having a first end pivotally connected to the armrest frame and a second end pivotally connected to the backrest portion.

### Claim 18 (depends on 9)

The sofa bed of claim 9, wherein the armrest frame comprises an armrest frame body substantially of a U-shape and a reinforcement transverse beam connected between two legs of the armrest frame body, wherein the slideway is formed on the reinforcement transverse beam.

### Claim 19 (depends on 18)

The sofa bed of claim 18, wherein the locking mechanism is provided with a pin extending towards the outside of the body frame, the slideway is a sliding groove formed on the reinforcement transverse beam having a first end positioned higher than a second end of the slideway, and the first end is opened towards an upper side edge of the armrest frame to receive the pin.

### Claim 20 (depends on 19)

The sofa bed of claim 19, wherein the reinforcement transverse beam has a channel-shaped cross section and an outer end of the pin is provided with a protrusion fitting with the channel-shaped cross section of the transverse beam.

### Claim 21 (depends on 18)

The sofa bed of claim 18, wherein the reinforcement transverse beam is provided with a slide rod, and the locking mechanism is provided with a slide sleeve configured to journal on the slide rod and slide along the slide rod.

### Claim 22 (depends on 18)

The sofa bed of claim 18, wherein a slide rod is provided under the reinforcement transverse beam, and the slide rod and a lower edge of the reinforcement transverse beam jointly define a sliding groove.

### Claim 23 (depends on 9)

The sofa bed of claim 9, wherein the sofa bed comprises a bottom support structure supported below the backrest portion and the seat portion and connected fixedly to the two armrest frames.

### Claim 24

A sofa bed, comprising:
a plurality of spring modules, each spring module comprising a conical spring and a spring bracket;
a body frame comprising a first plurality of longitudinal slide rails and a second plurality of transverse slide rails perpendicular to and intersecting the longitudinal slide rails, to allow the spring modules to be moved longitudinally and transversely on the body frame;
the spring bracket of each spring module configured to slidably engage with an adjacent pair of longitudinal slide rails or traverse slide rails; and
first and second armrest frames at first and second ends of the body frame, respectively.